Baud rate calibration method and device for a universal asynchronous transceiver
A technology for universal asynchronous and calibration devices, applied in the direction of synchronous devices, synchronization error correction, digital transmission systems, etc.
Active Publication Date: 2021-02-09
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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Therefore, for the UART, the clock accuracy must be at least ±4% to ensure that the cumulative error of the baud rate is less than 0.5bit. The design presents great challenges, especially for low-cost chips, and is unacceptable
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[0020] The core of the design idea and method of the present invention is based on the standard time reference, the mathematical statistics of the clock is performed through the detection circuit, and the statistical results are combined with quantification means to reduce the clock error and suppress the transmission error, so as to realize the problem of the universal asynchronous transceiver under the low-precision clock transmission. The following will describe in detail based on the implementation scheme based on the greatest common divisor of the UART.
[0021] like figure 1 As shown in the principle diagram of the invention, 100 represents the time reference, 200 represents the clock statistics module, 300 represents the clock precision module, 400 represents the clock interval module, 500 represents the baud rate calibration calculation module, and 600 represents asynchronous transmission and reception.
[0022] figure 1 The 100 in represents the time reference, whic...
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The present invention is a method and device for calibrating the baud rate of a universal asynchronous transceiver. The present invention uses the time reference as a reference, uses the sampling clock of the universal asynchronous transceiver to perform mathematical statistics on the time reference, and restores the universal asynchronous signal according to the statistical method combined with the time reference. The precise frequency of the transceiver sampling clock is based on the precise clock and the quantization interval is used as the basis to reasonably quantify the precise clock to a calculable interval, and the characteristic frequency of this interval is used as the characteristic clock frequency of the UART to calculate the UART Transmission parameters, to achieve the calibration of the transmission baud rate, in order to complete the universal asynchronous transceiver. The invention reduces the precision requirement on the sampling clock of the universal asynchronous transceiver through the time reference and the on-chip device, performs data transmission with the calibrated baud rate, and improves the stability of the universal asynchronous transceiver.
Description
technical field [0001] The invention belongs to the design field of integrated circuit chips, and in particular relates to a baud rate calibration method and device for a universal asynchronous transceiver. Background technique [0002] Universal Asynchronous Receiver / Transmitter (Universal Asynchronous Receiver / Transmitter), commonly called UART, is a standard protocol for low-speed data communication between devices. It only needs to occupy two wires to complete the sending and receiving of data (one for receiving data and one for sending data). Because of its simple protocol, it is widely integrated in microprocessors as a data transmission or debugging interface. [0003] The universal asynchronous transceiver is completely asynchronous data transmission. The traditional implementation method has error accumulation in the data transmission process. When the error accumulates to about 0.5 transmission bit time, it will lead to data transmission error. Taking a frame of 1...
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IPC IPC(8): H04L7/00
CPCH04L7/0016
Inventor 邹锦
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD